Furnace.



'PATENTED MAR. s, 1903. 0. B. MILLER & .0. 1).. COTTON; FURNACE.

APPLICATION FILED MAY 19, 1902.

(0277165 5 88 fiu/m UNITED f STATES PATENT OFFICE.

CHARLES B. MILLER, OF CHICAGO, ILLINOIS, AND ORVILLE D. COTTON, OF DETROIT, MICHIGAN; SAID MILLER ASSIGNOR TO SAID COTTON.

FURNACE.

SPECIFICATION forming part of Letters Patent N 0. 7 21,720, dated March 3, 1903.

Application filed May 19,1902. Serial No. 107.910. (Nomodeld T coll whOm it may concern.-

Be it known that we, CHARLES E. MILLER, residing at Chicago, in the county of Cook and State of Illinois, and ORVILLE D. COTTON,

' residing at Detroit, in the'county of Wayne and State of Michigan, citizens of the United States, have invented oertain'new and useful Improvements in Furnaces, of which the following is a full, clear, and exact specification.

IO Our invention relates to that class of furnaces in which the grate-bars converge to an oscillatory or rotary clinker-bar, which by its rotary or oscillatory motion removes the clinkers from the grate.

Our invention has for one of its objects to provide improved and simple means whereby the clinker-bar maybe rotated continuously in one direction.

Another object of our invention is to vary :0 the speed of rotation of the clinker-bar or stop it altogether, according to the requirements or condition of the fire.

A further object of our invention is to so construct the clinker-bar that a part of it may 2 5 be replaced without replacing the whole of the bar or replacing the shaft which turns it.

With these ends in view our invention consists in certain features of novelty in the construction, combination, and arrangement of 0 parts by which the said objects and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

5 In the said drawings, Figure 1 is a front elevation of our improvements in furnaces, a part of the slide-box, hereinafter described, being removed. Fig. 2 is asectional view on the line 2 2, Fig.1. Fig. 3 is a detail plan section on the line'3 3, Fig. 1. Fig. 4 is a detail perspective view of a coupling-pin, hereinafter described. Fig. 5 is a detail crosssection on the line 5 5, Fig. 1. Fig. 6 is a detail cross-section on the line 6 6, Fig. 2; and

Fig. 7 is a longitudinal sectional view of a part of the clinker-bar, illustrating a modification. .7

The grate-bars need not be illustrated but it is understood that in furnaces of this char- 5o acter they converge downwardly toward the center of the fire-box, as indicated by the dotted lines 1 in Fig. 1,and between their lower ends is arranged the rotary or oscillatory clinker-bar. In our invention this clinkerbar is composed of a number of sections 2 3 the shaft or rod 4 until it leaves the section to be removed, which will then drop out, allowing another to be put in its'place. These clinker bar sections where they come together are supported by the usual bearing 5, and-therefore their ends are left round and not provided with teeth at this point.

Where the square shaft 4 passes through the wall 6 of the furnace it is preferably provided With a round sleeve 7 for afiordingadequate bearing, the outer extremity of the shaft protruding through the sleeve, so as to constitute means for the attachment of the rotating mechanism, which will now be described.

As shown in Fig. 2, a gear-wheel or pinion 8 is inserted on the square end of the shaft4 and is provided with a hub 9, upon which is loosely journaled the lower end of a rockerarm 10, which carries a pivoted dog or pawl 11, engaging the teeth of pinion 8 in such a manner that when the arm 10 is oscillated in one direction it will rotate the pinion 8, and

consequently impart rotary motion to the clinker-bar, but when oscillated in the opposite direction Will pass freely over the teeth of pinion 8 without rotating the latter.' The arm 10 may be held on hub 9 by, an outside collar 12. The pinion 8 engages with an idle pinion or gear 13, j ournaled loosely on a studshaft 14, secured in the wheel 6 or in any other suitable support, and this pinion 13 is likewise provided with a hub 15, on which is journaled the lower end of a lever 16, which, like the arm 10, carries a pivoted pawl or dog 17, turned in the opposite direction from the dog 11 and engaging the teeth of pinion 13 in such a manner that when the arm 10 moves in that direction, which causes dog 11 to rotate pinion 8, said dog or pawl 17 will slide freely over the teeth of pinion 13 without rotating the latter; but when it moves in the opposite direction such dog or pawl 17 will impart rotary motion to pinion 13, and consequently continue to rotate pinion 8 in the same direction in which it was rotated by the dog or pawl 11, the lever 16 being pivotally connected to the arm 10 by a link 18, which holds the lever and said arm parallel. The lever 16 derives oscillatory motion for thus imparting continuous rotation to the clinkerbar from reciprocating rod 19, which is commonly employed in furnaces of this character and is operated by a small steam-engine or other suitable means not necessary to describe, but which is indicated diagrammatically by the driving crank-wheel 20 and pitman 21. The operating-bar 19 is provided with a box, which in this example of the invention is shown as composed of two halves 22 23, secured by rivets 24 to opposite sides of bar 19 and forming a support for a slide 25, which is pivotally connected to lever 16 by a link 26 or any other suitable device and is provided at opposite ends with stops 27,which prevent the slide from being entirely withdrawn or from being inserted too far. This slide is provided with apertures 28 29 30, which are of diiferent lengths, and the box 22 23 with a corresponding number of holes or apertures 31, arranged opposite the apertures 28 29 30, respectively, so that by passing a coupling-pin 32 through the registering apertures in the box and the slide the latter may be connected to the slide and compelled to move back and forth with the bar 19 a greater or less distance, accordingly as the coupling-pin be inserted through the short aperture 28 or one of the longer ones 29 30, the former being preferably of the same dimensions as the pin 32 and aperture 31 in the box, so that the slide will be compelled to move in unison with the rod 19. The purpose of this arrangement is to be able to vary the speed of rotation of the clinker-bar to suit the requirements or character of the fuel, it being desirable to rotate the bar more rapidly at one time than at another. Should it be desired to stop the rotation of the bar entirely, the coupling-pin 32 would be entirely withdrawn.

In the form of clinker-bar shown in Fig. 7, the sections which are shown at 2 3 are solid, and their ends are rabbeted together, as shown at 33, and held by screw or rivet 34 in such a manner that one of the sections may be removed and replaced without replacing the others.

Having thus described our invention, what we claim as new therein, and desire to secure by Letters Patent, is-- 1. In a furnace the combination of two reciprocatory members one of which is provided with apertures of diiferent lengths, and coupling means for engaging in either one of said apertures in one of said members and having operative connection with the other one of said members, an oscillatory clinker-bar operatively connected with one of said members and means for reciprocating the other one of said members, substantially as set forth.

2. In a furnace, the combination of two members one of which is slidably supported on the other and one of which has slots of different lengths and the other apertures which register with said slots, a coupling-pin adapted to be inserted through said slots and apertures for coupling said members together, means for reciprocating one of said members, a rotary clinker-bar, and operative connection between said clinker-bar and the other one of said members, substantially as set forth.

3. In a furnace the combination of areciprocatory bar, a box carried by said bar and having apertures therethrough, a slide having end stops carried by said box and provided with slots registering with said apertures, a coupling-pin adapted to be passed through one of said slots and the apertures in said box, a rotary clinker-bar and opera tive connection between said slide and clinkerbar, substantially as set forth.

CHARLES E. MILLER. ORVILLE D. COTTON Witnesses:

F. A. HOPKINS, W. D. CROSS. 

